show variables like 'sql_error_log%';
Variable_name	Value
sql_error_log_filename	sql_errors.log
sql_error_log_rate	1
sql_error_log_rotate	OFF
sql_error_log_rotations	9
sql_error_log_size_limit	1000000
sql_error_log_warnings	ON
sql_error_log_with_db_and_thread_info	ON
set global sql_error_log_rate=1;
# Trying to set the variable at runtime
SET sql_error_log_with_db_and_thread_info=OFF;
ERROR HY000: Variable 'sql_error_log_with_db_and_thread_info' is a read only variable
#
# Using test database from mtr
#
DROP DATABASE db;
ERROR HY000: Can't drop database 'db'; database doesn't exist
#
# Using no database at all
#
connect  con1,localhost,root,,*NO-ONE*;
DROP DATABASE dbnodb;
ERROR HY000: Can't drop database 'dbnodb'; database doesn't exist
disconnect con1;
connection default;
#
# Using database with name `NULL`
#
CREATE DATABASE `NULL`;
USE `NULL`;
DROP DATABASE db;
ERROR HY000: Can't drop database 'db'; database doesn't exist
TIME THREAD_ID HOSTNAME `mtr` WARNING 1286: Unknown storage engine 'InnoDB' : SELECT CONCAT(table_schema, '.', table_name) AS columns_in_mysql,   	 column_name, ordinal_position, column_default, is_nullable,          data_type, character_maximum_length, character_octet_length,          numeric_precision, numeric_scale, character_set_name,          collation_name, column_type, column_key, extra, column_comment     FROM INFORMATION_SCHEMA.COLUMNS       WHERE table_schema='mysql'         ORDER BY columns_in_mysql 
TIME THREAD_ID HOSTNAME `mtr` WARNING 1286: Unknown storage engine 'InnoDB' : SELECT CONCAT(table_schema, '.', table_name) AS columns_in_mysql,   	 column_name, ordinal_position, column_default, is_nullable,          data_type, character_maximum_length, character_octet_length,          numeric_precision, numeric_scale, character_set_name,          collation_name, column_type, column_key, extra, column_comment     FROM INFORMATION_SCHEMA.COLUMNS       WHERE table_schema='mysql'         ORDER BY columns_in_mysql 
TIME THREAD_ID HOSTNAME `mtr` WARNING 1286: Unknown storage engine 'InnoDB' : SELECT CONCAT(table_schema, '.', table_name) AS columns_in_mysql,   	 column_name, ordinal_position, column_default, is_nullable,          data_type, character_maximum_length, character_octet_length,          numeric_precision, numeric_scale, character_set_name,          collation_name, column_type, column_key, extra, column_comment     FROM INFORMATION_SCHEMA.COLUMNS       WHERE table_schema='mysql'         ORDER BY columns_in_mysql 
TIME THREAD_ID HOSTNAME `test` ERROR 1238: Variable 'sql_error_log_with_db_and_thread_info' is a read only variable : SET sql_error_log_with_db_and_thread_info=OFF 
TIME THREAD_ID HOSTNAME `test` ERROR 1008: Can't drop database 'db'; database doesn't exist : DROP DATABASE db 
TIME THREAD_ID HOSTNAME NULL ERROR 1008: Can't drop database 'dbnodb'; database doesn't exist : DROP DATABASE dbnodb 
TIME THREAD_ID HOSTNAME `NULL` ERROR 1008: Can't drop database 'db'; database doesn't exist : DROP DATABASE db 
DROP DATABASE `NULL`;